( ) * Pipeline constraints keep Waha Hub prices negative * Ample storage and mild weather forecast limit demand * Lower 48 states see drop in gas output, LSEG reports By Scott DiSavino Oct 7 (Reuters) – U.S. natural gas futures edged up about 1% on Tuesday on a decline in daily output. That increase came despite lower flows to liquefied natural gas (LNG) export plants and forecasts for less demand next week than previously expected. Front-month gas futures for November delivery on the New York Mercantile Exchange (NYMEX) rose 4.5 cents, or 1.3%, to $3.402 per million British thermal units (mmBtu) at 9:12 a.m. EDT (1313 GMT). In the cash market, average prices at the Waha Hub in the Permian Shale in West Texas remained in negative territory for a 10th day in a row as ongoing pipeline mainte

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